<template>
  <div class="sidebar">
    <el-menu class="sidebar-el-menu"
             :default-active="onRoutes"
             :collapse="collapse"
             background-color="#324157"
             text-color="#bfcbd9"
             active-text-color="#20a0ff"
             unique-opened
             router>
      <template v-for="item in items">
        <template v-if="item.children">
          <el-submenu :index="item.url"
                      :key="item.url">
            <template slot="title">
              <i :class="item.icon"></i>
              <span slot="title">{{ item.title }}</span>
            </template>
            <template v-for="subItem in item.children">
              <el-submenu v-if="subItem.children"
                          :index="subItem.url"
                          :key="subItem.url">
                <template slot="title">
                  <i :class="subItem.icon"></i>
                  {{ subItem.title }}</template>
                <el-menu-item v-for="(threeItem,i) in subItem.children"
                              :key="i"
                              :index="threeItem.url">{{ threeItem.title }}</el-menu-item>
              </el-submenu>
              <el-menu-item v-else
                            :index="subItem.url"
                            :key="subItem.url"> <i :class="subItem.icon"></i>{{ subItem.title }}</el-menu-item>
            </template>
          </el-submenu>
        </template>
        <template v-else>
          <el-menu-item :index="item.url"
                        :key="item.url">
            <i :class="item.icon"></i>
            <span slot="title">{{ item.title }}</span>
          </el-menu-item>
        </template>
      </template>
    </el-menu>
  </div>
</template>

<script>
import bus from './bus'
import { getMenu } from '@/api/back/system'
export default {
  data () {
    return {
      collapse: false,
      items: [
        {
          icon: 'el-icon-s-custom',
          url: 'dashboard',
          title: '系统首页'
        },
        {
          icon: 'el-icon-s-custom',
          url: '8',
          title: '任务模块',
          children: [
            {
              url: 'taskdefine',
              title: '任务定义'
            },
            {
              url: 'taskdeploy',
              title: '任务部署'
            }, {
              url: 'taskperfromlog',
              title: '任务执行日志'
            }

          ]
        }
      ]
    }
  },
  computed: {
    onRoutes () {
      if (this.$route.path.indexOf('/') >= 0) {
        return this.$route.path.split('/')[2]
      }
    }
  },
  created () {
    // 通过 Event Bus 进行组件间通信，来折叠侧边栏
    bus.$on('collapse', msg => {
      this.collapse = msg
      bus.$emit('collapse-content', msg)
    })
    this.getMenu()
  },
  methods: {
    // 获取菜单
    async getMenu () {
      await getMenu('/menu/get/' + this.$backutils.user().id, '', 'get', 'core').then(res => {
        if (res.code === 200) {
          let menu = res.data
          let arr = []
          for (const item of menu) {
            let result = []
            result.id = item.id
            result.icon = item.icon
            result.title = item.title
            if (item.url !== null) {
              result.url = item.url.split('/')[2]
            } else {
              result.url = 'root'
            }
            let children = item.children
            if (children.length !== 0) {
              let arr = []
              this.packageMenuChildren(children, arr)
              result.children = arr
            }
            arr.push(result)
          }
          this.items = arr
          console.log(arr)
        } else {
          this.items = []
          this.$message.error(res.message)
        }
      }).catch(val => {
        this.$message.error(val.response === undefined ? val : val.response.data.message)
      })
    },
    packageMenuChildren (children, arr) {
      for (const item of children) {
        let result = {}
        result.id = item.id
        result.icon = item.icon
        result.title = item.title
        if (item.url !== null) {
          result.url = item.url.split('/')[2]
        } else {
          result.url = 'root'
        }
        let children = item.children
        if (children.length !== 0) {
          let arr = []
          this.packageMenuChildren(children, arr)
          result.children = arr
        }
        arr.push(result)
      }
    }
  }
}
</script>

<style scoped>
.sidebar {
  display: block;
  position: absolute;
  left: 0;
  top: 70px;
  bottom: 0;
  overflow-y: scroll;
}
.sidebar::-webkit-scrollbar {
  width: 0;
}
.sidebar-el-menu:not(.el-menu--collapse) {
  width: 250px;
}
.sidebar > ul {
  height: 100%;
}
</style>
